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4-20 Print Quality Samples
Sample 17: Varying Print Density
Figure 4-17. Varying Print Density
Description: Some areas of the print are lighter or darker than normal. Examine the letters
H, T, M, and E on your test print. If the vertical sections are sufficiently dark, but the diag-
onal sections appear stair-stepped, the problem may be is related to the printhead.
Go to TAG 810: Uneven Density or Dark Areas on Prints, TAG 815: Prints Resulting
From Printhead Malfunctions.
- Cut Sheet Printers 1
- Maintenance Manual 1
- Models C30 and C30D 1
- Printing History 2
- Trademarks 2
- Warnings and Cautions 3
- Using This Manual 4
- Other Manuals 5
- General Printer Maintenance 13
- Abbreviations and Acronyms 14
- Printer and 15
- Troubleshooting 15
- Overview 15
- Contents 16
- Theory of Operation 17
- Cycle of Operation 18
- Paper Path and Cycle Sequence 19
- Paper Path 20
- Sensor and Switch Locations 25
- Top view 26
- Front view 26
- Developer right view 26
- Developer left view 26
- Right side view 27
- Top left, duplex tray view 27
- Troubleshooting Overview 29
- • For duplex printers, press: 30
- Protocol Converters 31
- Reading the Error Log 31
- Confirming Line Power 32
- • Power-on-reset the printer 33
- Standard Procedures 35
- Producing a Developed Image 36
- Producing a Toner Patch 36
- Completing a Service Call 37
- Clearing the Error Log 38
- TAG Cross 39
- Reference Tables 39
- TAG Cross-Reference Tables 40
- Analysis Guide 53
- Yes: Go to #3 in this TAG 60
- Guide to Operations 63
- No: Continue 104
- Yes: Continue 114
- Error Code: 081, 082, 083 127
- Jobs offsetting improperly 127
- Jogging motor 127
- Error Code: 101 155
- Possible Defects: IGS board 155
- 606, 600, 610 164
- IGS board 164
- Problem Resolution 164
- TAG 600: AC Power Malfunction 170
- Wiring Table 180
- Error Code: 751 194
- Dark Horizontal Bands 204
- TAG 805: Black Prints 215
- Print Quality 255
- Print Quality Samples 257
- Sample 1: Good Quality Print 258
- Sample 2: Washout 259
- Sample 3: 260
- Blank Print 260
- Sample 4: Light Print 261
- Light Print With Background 262
- Voids of White Spots 263
- Light Vertical Streaks 264
- Blank Vertical Bands 265
- Light Horizontal Bands 266
- Black or Dark Print 267
- Areas on Prints 268
- Dark Vertical Lines 269
- Sample 13: Skewed Prints 270
- Sample 14: Misregistration 271
- Sample 15: Overtoned Print 272
- Blurred Images or Characters 273
- Varying Print Density 274
- Sample 18: Background 275
- Sample 19: Residual Images 276
- Sample 20: Wrinkles 277
- Sample 21: Fusing Problems 278
- Diagnostic 279
- Diagnostic Tests 281
- How to Run Diagnostics 281
- 001 Operator Panel Test 282
- 002 Upper Cassette Test 282
- 003 Lower Cassette Test 283
- (004 intentionally excluded) 283
- 005 Sensor Test Sequence 284
- 007 Counter Test 285
- 008 Jogging Motor Test 286
- 009 Photoconductor Test 286
- 010 Toner Supply Motor Test 287
- 011 Main Charger Test 288
- 012 Transfer Charger Test 289
- 013 Erase Lamp Test 290
- (014 intentionally excluded) 290
- 016 Duplex Feed Motor Test 292
- Diagnostic Tests 5-19 297
- 101 EIGS/MIGS Board Test 298
- Diagnostic Tests 5-21 299
- (106 intentionally excluded) 300
- • Press STOP to exit 301
- 111 LED Printhead Test 302
- (109 intentionally excluded) 303
- Wiring Diagrams 305
- • Voltage isolation diagrams 307
- Connector (J/P) Index 308
- Connector Locations 310
- J/P 43, 45, 47 311
- J/P 46, 48 311
- J/P 59, 61 311
- J/P 119, 120, 127, 128 311
- 1 2 3 4 5 6 7 8 91011121314 312
- Connectors on the Back Cover 315
- 123456789101112131516 141718 319
- 1920212223242526 319
- 27282930313233343536 319
- Voltage Isolation Diagrams 320
- (Simplex) +24 Vdc Circuits 322
- (Duplex) +12 Vdc Circuits 324
- J/P331-2 324
- J/P323-2 324
- J/P305-2 324
- Ground System 325
- Host Interface Reference 326
- IBM PC/XT to Printer 329
- IBM PC/AT to Printer 329
- RS-422 Host interface 330
- IBM Parallel to Printer 332
- DOS software 333
- Circuit Board Settings 334
- PCL Board Settings 335
- Removal/Replacement 337
- Procedures 337
- Before You Begin 340
- Front Cover Removal 341
- Back Cover Removal 342
- Lower Back Cover Removal 343
- Left Side Cover Removal 344
- Replacement Note: 345
- Ground Screw 347
- Back Detail 347
- Retaining Clip 347
- Vacuum Transport Detail 348
- Mounting Screws 348
- Top Cover Removal 350
- Top Cover Support Removal 351
- Top Cover Hinge Removal 352
- Rear Duplex Cover Removal 353
- Front DuplexCover Removal 354
- Operator Panel Removal 355
- Counter Removal 356
- IGS Board Removal 357
- PCL Board Removal 358
- Printhead Assembly Removal 359
- Disk Drive Housing Removal 361
- Cooling Fan Removal 362
- Duplex Fan Removal 363
- Toner Motor Removal 364
- AC Power Supply Removal 365
- DC Power Supply Removal 367
- High Voltage Unit Removal 368
- Paper Feed Drive Cover 369
- CN64 Bracket 369
- Mounting Screw 369
- (under CN64 bracket) 369
- Seam Sensor 370
- Front Detail 370
- Power Control Board Removal 374
- Upper Cassette Mount Removal 377
- Lower Cassette Mount Removal 381
- • Remove the cam (one screw) 382
- Upper Paper Guide Removal 384
- Upper Paper Guide 386
- Underside 386
- Lower Paper Guide Removal 387
- Paper Timing Guide Removal 388
- Cleaner Drive Belt Removal 390
- Cleaner Drive Removal 391
- Fuser Drive Belt Removal 392
- Fuser Drive Removal 393
- Paper Feed Drive Belt Removal 394
- Paper Timing Roller Removal 395
- Upper Feed Roller Removal 396
- Lower Feed Roller Removal 397
- Upper Pick-Up Roller Removal 398
- 1 Open the back cover 399
- Lower Pick-Up Roller Removal 400
- Job Offset Assembly Removal 402
- Exit Pinch Roller Removal 404
- Upper Static Brush Removal 406
- Lower Static Brush Removal 407
- Exit Roller Assembly Removal 408
- Exit Cover Removal (Simplex) 410
- Exit Cover Removal (Duplex) 412
- Paper Exit Sensor Removal 414
- Paper Full Sensor Removal 415
- Side Cover 417
- AC Power Supply 417
- Erase Lamp Removal 419
- EP Cover Removal 420
- Main Motor Removal 422
- Replacement Notes: 423
- Main Gear Drive Removal 424
- Paper Guide 427
- Registration Motor Detail 427
- Side Detail 430
- Lower Duplex 430
- Roller Cover 430
- “A” Roller Removal 432
- “B” Roller Removal 433
- “C” Roller Removal 434
- “C” Roller Solenoid Removal 435
- C-Clip Location 437
- Chapter 8 439
- Introduction 441
- 1200-Sheet/2500-Sheet Feeder 442
- Bench Test Procedure 443
- Prefeed Adjustment Procedure 444
- Input Control Board Logic 445
- 1400-Sheet Stacker 447
- Options 8-11 449
- Options 8-13 451
- Output Control Board Logic 452
- 8-16 Options 454
- General Printer 455
- Maintenance 455
- Tools/Supplies 458
- End User Cleaning Kit 458
- Printer/Maintenance Record 458
- HISTORY LOG 459
- Every-Call Cleaning Procedure 460
- Clean the Developer Unit 461
- Clean the Transfer Charger 461
- Run Test Prints 461
- Adjusting Paper Feed Tension 462
- Lubrication Procedure 465
- Front View Lubrication Tables 467
- Duplex Only 467
- Rear View Lubrication Tables 469
- Appendix A 475
- Index-3 479
- Index-5 481
- Index-7 483
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